McMillan Civil introduced a Patented NVSC - Non Vibration Stone Column technique to the New Zealand market following the Christchurch Earthquakes.
Please click here to download our Non Vibration Stone Column brochure

This provides the following benefits over traditional vibrating stone column installations:

  • The method is vibration free so it can be used immediately next to sensitive sites or neighbouring buildings. (To within 1.5m of existing buildings have been done.) 

  • The method is fast to set up, and column installation can begin within 3 hours of the equipment arriving on site depending upon which base machine is used. 

  • Only two pieces of plant are required at each site. The stone column machine, and a loader. Stone deliveries by truck.

  • The equipment involves less high pressure and high wear hydraulic components, and is subsequently more reliable with reduced costs.

  • This method allows the introduction of cement, to create cement stabilised columns, providing increased load transfer properties. 

  • Graded filter selected materials can be used so columns are more resistant to clogging in liquefaction events.  Columns remain effective for multiple events. 

  • No introduction of high pressure water or air required so relatively mess free. Sites immediately adjacent to sensitive environments completed. 

  • Method builds complete columns at all times, so there is no-void space introduction to allow column contamination at any time, unlike methods where a plunging motion is used.  

  • The tooling is a hybrid drilling assembly, this allows tool penetration through hard layers and removes the requirement for predrilling, that is often required for vibrating tooling. 

Phone: 03 349 5587
McMillan Civil Ltd